failed to find highlights of `sys` module

[pixystone]

2018-05-29 17:27:57,151 UTC - ERROR - pyls.jsonrpc.endpoint - Failed to handle request 16
Traceback (most recent call last):
  File "/Users/pixy/work/idea-projects/python-language-server/data/virtualenv/lib/python2.7/site-packages/pyls/jsonrpc/endpoint.py", line 113
, in consume
    self._handle_request(message['id'], message['method'], message.get('params'))
  File "/Users/pixy/work/idea-projects/python-language-server/data/virtualenv/lib/python2.7/site-packages/pyls/jsonrpc/endpoint.py", line 182
, in _handle_request
    handler_result = handler(params)
  File "/Users/pixy/work/idea-projects/python-language-server/data/virtualenv/lib/python2.7/site-packages/pyls/jsonrpc/dispatchers.py", line 
23, in handler
    return method(**(params or {}))
  File "/Users/pixy/work/idea-projects/python-language-server/data/virtualenv/lib/python2.7/site-packages/pyls/python_ls.py", line 246, in m_
text_document__document_highlight
    return self.highlight(textDocument['uri'], position)
  File "/Users/pixy/work/idea-projects/python-language-server/data/virtualenv/lib/python2.7/site-packages/pyls/python_ls.py", line 190, in hi
ghlight
    return flatten(self._hook('pyls_document_highlight', doc_uri, position=position)) or None
  File "/Users/pixy/work/idea-projects/python-language-server/data/virtualenv/lib/python2.7/site-packages/pyls/python_ls.py", line 113, in _h
ook
    return hook_handlers(config=self.config, workspace=self.workspace, document=doc, **kwargs)
  File "/usr/local/Cellar/python/2.7.14/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pluggy/__init__.py", line 617, i
n __call__
    return self._hookexec(self, self._nonwrappers + self._wrappers, kwargs)
  File "/usr/local/Cellar/python/2.7.14/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pluggy/__init__.py", line 222, i
n _hookexec
    return self._inner_hookexec(hook, methods, kwargs)
  File "/usr/local/Cellar/python/2.7.14/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pluggy/__init__.py", line 182, i
n __call__
    return outcome.get_result()
  File "/usr/local/Cellar/python/2.7.14/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pluggy/callers.py", line 77, in 
get_result
    _reraise(*ex)  # noqa
  File "/usr/local/Cellar/python/2.7.14/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pluggy/callers.py", line 48, in 
from_call
    result = func()
  File "/usr/local/Cellar/python/2.7.14/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pluggy/__init__.py", line 180, i
n <lambda>
    outcome = _Result.from_call(lambda: self.oldcall(hook, hook_impls, kwargs))
  File "/usr/local/Cellar/python/2.7.14/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pluggy/__init__.py", line 216, i
n <lambda>
    firstresult=hook.spec_opts.get('firstresult'),
  File "/usr/local/Cellar/python/2.7.14/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pluggy/callers.py", line 201, in _multicall
    return outcome.get_result()
  File "/usr/local/Cellar/python/2.7.14/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pluggy/callers.py", line 77, in get_result
    _reraise(*ex)  # noqa
  File "/usr/local/Cellar/python/2.7.14/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pluggy/callers.py", line 180, in _multicall
    res = hook_impl.function(*args)
  File "/Users/pixy/work/idea-projects/python-language-server/data/virtualenv/lib/python2.7/site-packages/pyls/plugins/highlight.py", line 31, in pyls_document_highlight
    } for d in usages if local_to_document(d)]
TypeError: unsupported operand type(s) for -: 'NoneType' and 'int'

d.line is None in one of definitions

[pixystone]

see davidhalter/jedi#1131